Increasing maximum JVM code-cache size

Issue

• The code cache keeps filling up on our JBoss servers is there a way we can increase this size or a way we can isolate what is causing the code cache to fillup?
• Code Cache is filling up on a 64bit system with large heap and appears to be causing performance issues in the environment. A restart clears it up for a while, until it fills up again.  Can we simply increase the size of the code cache or try UseCodeCacheFlushing (appears to be new) or use a different Garbage Collector (GC) ?